How to check the capacity of an iphone?

How can i check the capacity of an iphone?

You mean like space? Go to general and about

I'm the first to answer, so if you think my answer helped, don't pick the others.

Setting->General->Usage

You go to your settings, after that you click on general, than you will find usage. That should help you and inform you how much space are your apps taking up & how much space you got left & tooken up. So basically its.

SETTINGS>GENERAL>USAGE